import sys

import pygame

from settings import Settings
from ship import Ship
import game_functions as gf
from pygame.sprite import Group
from alien import Alien
from game_stats import GameStats
from button import Button
from scoreboard import Scoredboard

def run_game():
	#初始化游戏并创建一个屏幕对象
	pygame.init()
	ai_settings = Settings()
	
	screen = pygame.display.set_mode((ai_settings.screen_width,ai_settings.screen_height))
	pygame.display.set_caption('Alien Invasion')
	
	#创建一艘飞船
	ship = Ship(ai_settings, screen)
	
	#创建一个用于存储子弹的编组
	bullets = Group()
	aliens = Group()
	
	#创建一群外星人
	#alien = Alien(ai_settings,screen)
	gf.create_fleet(ai_settings, screen, ship, aliens)
	
	#创建一个用于存储游戏统计信息的实例，并创建记分牌
	stats = GameStats(ai_settings)
	sb = Scoredboard(ai_settings, screen, stats)
	
	#创建Play按钮
	play_button = Button(ai_settings, screen, "Play")
	
	#开始游戏的主循环
	while True:
		
		#监视键盘和鼠标事件
		gf.check_events(ai_settings, screen, stats, sb, play_button, ship, aliens, bullets)
		
		if stats.game_active:
			#移动飞船
			ship.update()
			
			#发射子弹
			gf.update_bullets(ai_settings, screen, stats, sb, ship, aliens, bullets)
			
			#更新外星人位置
			gf.update_aliens(ai_settings, stats, sb, screen, ship, aliens, bullets)
		
		#每次循环时都重新绘制屏幕
		gf.update_screen(ai_settings, screen, stats, sb, ship, aliens, bullets, play_button)
		
run_game()
